Piranha Plants are a carnivorous plant in the Mario. There aremany types of Piranha Plants, including them who don't comes up from Warp Pipes when a character is on or beside them, the one that do do it anyway, some spits fire, some don't have pipes, some isn't bound to the mark and so on.
In the Super Smash Bros. series
In Super Smash Bros.
Piranha Plants sometimes appears out of the Warp Pipes on the Mushroom Kingdom stage. They are enemies and don't seems to have a settled coming between the two pipes. These are one of the easiest enemies to avoid in the entire Smash-series, as they won't appear if the character is on the pipe and neither on the side of the pipes. There pipes are also very low, making them easy to jump over.
In Super Smash Bros. Brawl
Piranha Plants may sometims appear as stage elements on PictoChat. However, here they don't go up or down, and stays on the sole stationary platforms. Also, Petey Piranha, the first boss of the Subspace Emissary, is a Piranha Plant. [1]